Table 5.

Participant dropout at different stages of the survey, from 724 participants who originally started the survey.

Survey page number	Description	Full completion of surveya, n	Dropouts, n
9	Questions about reasons for not consenting; these were for participants who had not consented to participation on page 1	15	0
8	Demographics	441	1
7	A3b: Final usage decision	N/Ac	1
6	Q3d: In-depth evaluation based on 25 key questions	N/A	16
5	A2e: Intermediate usage decision	N/A	45
4	Q2f: Assessment of whether the available information suffices for assessing the app based on the nine quality principles	N/A	11
3	Q1g: Participants’ assessments of nine predefined quality principles	N/A	44
2	A1h: Initial usage decision	N/A	59
1	Introduction and consent	N/A	91
N/A	Sum of participants	456	268

^aParticipants were considered to have completed the survey either by completing the final demographics questions on page 8 or, for those who had not consented to participation, by providing reasons for not giving their consent on page 9.

^bA3: assessment 3.

^cNot applicable.

^dQ3: questionnaire 3.

^eA2: assessment 2.

^fQ2: questionnaire 2.

^gQ1: questionnaire 1.

^hA1: assessment 1.